-er a-a a-c aaa aac aad aae aan aao aar ac- aca acc acd ace acn aco acr ad- ada adc add ade adn ado adr aea aec aed aee aen aeo aer an- ana anc and ane ann ano anr aoa aoc aod aoe aon aoo aor ar- ara arc ard are arn aro arr c-- caa cac cad cae can cao car cca ccc ccd cce ccn cco ccr cda cdc cdd cde cdn cdo cdr ce- cea cec ced cee cen ceo cer cn- cna cnc cnd cne cnn cno cnr co- coa coc cod coe con coo cor cra crc crd cre crn cro crr daa dac dad dae dan dao dar dca dcc dcd dce dcn dco dcr dda ddc ddd dde ddn ddo ddr de- dea dec ded dee den deo der dna dnc dnd dne dnn dno dnr doa doc dod doe don doo dor dra drc drd dre drn dro drr eaa eac ead eae ean eao ear ec- eca ecc ecd ece ecn eco ecr ed- eda edc edd ede edn edo edr eea eec eed eee een eeo eer en- ena enc end ene enn eno enr eo- eoa eoc eod eoe eon eoo eor era erc erd ere ern ero err naa nac nad nae nan nao nar nca ncc ncd nce ncn nco ncr nda ndc ndd nde ndn ndo ndr ne- nea nec ned nee nen neo ner nna nnc nne nnn nno no- noa noc nod noe non noo nor nra nrc nrd nre nrn nro nrr oaa oac oad oae oan oao oar oc- oca occ ocd ocn oco ocr oda odc odd ode odn odo odr oea oec oed oee oen oeo oer on- ona onc ond one onn ono onr oo- ooa ooc ood oon ooo oor or- ora orc ord ore orn oro orr ra- raa rac rad rae ran rao rar rca rcc rcd rce rcn rco rcr rda rdc rdd rde rdn rdo rdr re- rea rec red ree ren reo rer rna rnc rnd rnn rno rnr roa roc rod roe ron roo ror rra rrc rrd rrn rrr